Piston ring assembly for a new natural gas vehicle symmetrical multistage wobble-plate compressor

Natural gas is an alternative fuel of choice in the market today due to the increase in the price of petroleum, as well as out of environmental concerns. Pressure requirement for a natural gas vehicle (NGV) storage tank is 3000 psig (206 bars). Thus, at NGV refueling facilities, the natural gas need to be stored at a higher pressure in order to refuel the NGV at the pressure required. Compressors are needed in the compression process at the refueling facilities. A new compressor design for natural gas refueling appliance has been developed which is the symmetrical multistage wobble-plate compressor. This compressor design is the newest variation of the axial reciprocating piston compressor. The success of the compressor design in compressing gas depends on the piston ring assembly design. Through this paper, the process of designing the piston ring assembly and considerations taken for this new compressor design were explained. The results presented are those from preliminary tests using air on the working fluid. Real tests on natural gas are to be organised utilising all the experience and lesson learnt from that on air

MODELLING OF CO2 SOLUBILITY IN DIETHANOLAMINE, NMETHYLDIETHANOLAMINE AND THEIR MIXTURES USING ARTIFICIAL NEURAL NETWORK

Natural gas has a wide range of acid gas concentrations, from parts per million to 50 volume percent and higher, depending on the nature of the rock formation from which it comes. Because of the corrosiveness of H2S and CO2 in the presence of water and because of the toxicity of H2S and the lack of heating value of CO2, sales gas is required to be sweetened to contain no more than a quarter grain H2S per 100 standard cubic feet (4 parts per million) and to have a heating value of no less than 920 to 980 Btu/SCF, depending on the contract. The most widely used processes to sweeten natural gas are those using the alkanolamines, and of the alkanolamines the two most common are n-methyldiethanolamine (MDEA) and diethanolamine (DEA). In this research, data from Khalid Osman et al (2012), A. Benamor et al (2005) and Zhang et al (2002) will be used to simulate the solubility of CO2 in MDEA + DEA aqueous solution using ANN model and the performance will be compared to show which model is better for CO2 absorption. Besides, the study of CO2 solubility in MDEA and DEA aqueous solution respectively will be using data from Jou et al (1982) and Lee et al (1972) works and simulation of ANN model was used to compare the performance between ANN model and the reference research works mentioned earlier. Developed model has an absolute relative deviation (δAAD) of 8.71% while δAAD for data from Khalid Osman et al (2012), A. Benamor et al (2005) and Zhang et al (2002) are 17.06%, 12.09% and 9.82% respectively. In terms of pure amine prediction, ANN model of CO2 solubility predicted in pure MDEA has δAAD of 8.29% while the reference paper which is A. Benamor et al (2005) has absolute relative deviation of 10.76%. For prediction in pure DEA, the model has δAAD of 3.33% compared to reference paper which is also from A. Benamor et al (2005) with 4.72%. ANN has great ability to predict CO2 solubility in pure MDEA, DEA, and their mixtures only by developing models for each situation and condition due to the limitation of ANN itself which cannot simulate the new input data if they do not have same patterns with the one that has been used to develop the model

Extracurricular suggestion web-system using rule-based technique / Syahrom Zamzuri

An expert system is a computer application that is seamlessly integrated with display of real world scene and is a growing area in many field studies which solves complicated problems that would otherwise require extensive human expertise. With today technology advancement it is possible to solve problems without seeing an expert within the same room. Choosing the right clubs to join is hard when the new students does not know what are the clubs that available to join, does it suits their preference, what kind of activity the clubs do or what is the benefit that they can get from it. Therefore, this project focused on aiding the new students of UiTM Jasin in choosing suitable extracurricular clubs for them to join by giving options with the help of Student Affair Administration through web-based system. Therefore, this system will fulfil the task. SPIRAL model is used for the development of this web-based system, because the model have the ability which allow developer to improve the system after development for any changes and released it back to the user

Preparation of Vocational College Graduates as Skilled Workforce in the Local Construction Industry

Construction industry is growing rapidly along with the development of a country. This situation caused a high demand of workforce in this industry until the hiring of foreign workers becomes a necessity, as seen in Malaysia’s scenario. To overcome this issue, the government of Malaysia established many Technical and Vocational Education and Training (TVET) institutes that have potential to produce local workforce as highly skilled workers in construction industry. However, the preparation of these institutes for their students have never been analyzed, as the involvement of students from TVET institutes in local construction industry as skilled workers is still low, making their preparation method as an issue. Therefore, this research will identify the types of preparation method by TVET institutes for students pursuing programmes related to construction industry, and to assess teaching strategies for programmes related to construction industry to improve student preparation to become skilled workforce. To achieve the main objectives of this research, data collection is performed by interviewing teachers from three Vocational Colleges (VC) namely VC Kluang, VC Klang and VC Taiping, which are teaching Construction Technology programmes. It can be concluded that VCs have adequate preparation to produce graduates that can become skilled workforce in the construction industry. The results conclude that there are two types of preparation method made by the VCs; preparation method in the classroom and preparation method outside the classroom. The classroom preparation method includes laboratory training and teaching using modules designed to fit industrial needs. The results from outside classroom preparation include extra-curricular activities and construction site visits. As for results of the second objective, the teaching strategies to improve student preparation for skilled workforce is through the emphasis of safety during construction to students and the raising of student interest in Construction Technology programmes through industry participation. However, actions need to be taken in order to solve the issues that include a lack of equipment and no large area for computers. This study can help VCs to enhance the student preparedness to work in the construction industry

PERSEPSI PEMUDA TENTANG MINUM KHAMAR PADA MALAM WALIMATUL ‘URSY DITINJAU DARI HUKUM ISLAM (Studi Kasus Di Desa Sorek Satu Kecamatan Pangkalan Kuras)

i ABSTRAK Ikbal Syahrom Fatrizal (2022): “Persepsi Pemuda Tentang Minum Khamar Pada Malam Walimatul‘Ursy Ditinjau Dari Hukum Islam (Studi Kasus Di Desa Sorek Satu Kecamatan Pangkalan Kuras)”. Penulisan Skripsi ini dilatar belakangi oleh walimatul ‘urs yang diadakan oleh pasangan suami isteri sebagai bentuk syukur dan pengumumamn pernikahan pada khalayak umum. Akna tetapi, pada malam tersbeut, banyak diantara mudamudi yang menyalah artikan makna walimatul ‘urs yang di adakan oleh pasutri tersebut. Walimah yang seharusnya berisi dengan alunan doa’a dan ucapan selamat justru dijadikan sebagai pentas untuk melakukan perbuatan maksiat seperti meminum khamr atau minuman keras yang sebangsa dengannya. Kejadian ini tentu bertentangan dengan aturan dan amaran serta hikmah walimah sebagaimana termaktub dalam islam. Berdasarkan kenyataan ini, Penulis perlu melakukan penelitian tentang Persepsi Pemuda Tentang Minum Khamar Pada Malam Walimatul‘Ursy Ditinjau Dari Hukum Islam yang berlokasi di Desa Sorek Satu Kecamatan Pangkalan Kuras Kabupaten Pelalawan. Adapun rumusan masalah dalam penelitian ini adalah Bagaimana persepsi Pemuda tentang minum khamar pada malam pesta Walimatul ‘Ursy di Desa Sorek Satu Kecamatan Pangkalan Kuras Kabupaten Pelalawan dan Bagaimana tinjauan dari hukum Islam terhadap persepsi Pemuda Desa Sorek Satu Kecamatan Pangkalan Kuras Kabupaten Pelalawan tentang minuman khamar pada malam pesta Walimatul ‘Ursy ditinjau dari hukum Islam. Jenis penelitian ini adalah penelitian lapangan. Subjek penelitian ini adalah pemuda, masyarakat dan tokoh adat. Sedangkan objek penelitian ini adalah perspektif pemuda Desa Sorek Satu Kecamatan Pangkalan Kuras Kabupaten Pelalawan tentang meminum khamr pada malam walimatul ‘urs. Adapun yang menjadi populasi dalam penelitian ini terdiri dari pemuda, masyarakat dan tokoh adat yang ada di Desa Sorek Satu Kecamatan Pangkalan Kuras Kabupaten Pelalawan, yang terdiri dari 2 orang tokoh adat 20 orang tokoh pemuda yang senantiasa aktif dalam mengikuti kegiatan walimatul ‘urs, serta 11. 521masyarakat yang ada di Desa Sorek Satu Kecamatan Pangkalan Kuras Kabupaten Pelalawan. Dalam hal ini penulis mengambil sebagian dari jumlah populasi secara acak dengan menggunkan teknik Random Sampling yang berjumlah 10 orang. Dalam penelitian ini dapat disimpulkan dua kesimpulan: Persepsi pemuda Desa Sorek Satu Kecamatan Pangkalan Kuras Kabupaten Pelalawan tentang meminum minuman keras pada malam Walimatul ‘Ursy adalah perilaku yang salah dan tidak dibenarkan secara tabi’at yang berlaku. meskipun, hampir dapat kita katakana pada setiap acara malam pesta Walimatul ‘Ursy terdapat muda-mudi yang meminum minuman keras tersebut.Kedua, Persepsi pemuda ini, sejatinya telah tepat dan sesuai. Meskipun belum sempurna sebagaimana tuntutan al-Qur’an dan hadis yang diriwayatkan oleh Imam Muslim tentang mencegah kemungkaran. Kata Kunci : Walimatul ‘Ursy, pemuda, Minuman Kham

Analysis of trace metal contamination in Pahang River and Kelantan River, Malaysia

The primary objective of this study is to determine trace metal contamination in environmental samples obtained from Pahang River and Kelantan River, Malaysia which may help to identify the risk of sustainable dredging in these areas. This research also proceeds to compare the trace metal concentration with the National Water Quality Standards of Malaysia, Interim Canadian Sediment Quality Guidelines and Malaysian Food Act 1983 to determine its limits and risks. Samples of water, sediment, snails and fishes were collected and analyzed for As, Cu, Cd, Cr, Fe, Pb, Ni, Mn, and Hg by using atomic absorption spectrophotometer. It was found that the concentration of trace metals namely As, Cu, Cd, Cr, Pb, Ni, and Hg in river water, sediment, snail and fish samples in Pahang River were lower than the maximum allowable limits, except for Fe and Mn. In Kelantan River, the concentration of trace metals indicating that it is contaminated with Fe, Mn, Pb, Cr, Cu, Hg, and As as all trace metals exceeded the maximum allowable limits. Negative impacts may arise, and the river may contaminate more in future if there is no proper management to tackle this issue during execution of dredging activities

Simulasi Prediksi Tekanan Kontak pada Permukaan Acetabular Cup dengan Aplikasi Permukaan Bertekstur pada Total Hip Arthroplasty

Kajian ini bertujuan untuk menganalisa tekanan kontak pada permukaan acetabular cup dengan dan tanpa paplikasi permukaan bertekstur. Kontribusi utama dari studi ini adalah mempelajari efek penambahan dimple terhadap tekanan kontak yang berkorelasi terhadap keausan yang terjadi. Pendekatan dengan menggunakan perangkat lunak dilakukan dengan melakukan pemuatan fisiologis sambungan tulang pinggul secara 3D dalam kondisi berjalan normal. Analisa tekanan kontak dilakukan secara kontak langsung dan deskritasi elemen hingga dengan metode dua kutub dilakukan untuk memberikan hasil tekanan kontak yang akurat. Hasil menunjukkan bahwa model total hip arthroplasty dengan penambahan dimple dapat mengurangi tekanan kontak untuk seluruh fase dalam satu siklus penuh yang menjelaskan bahwa penambahan dimple pada permukaan acetabular cup di total hip artroplasti dapat mengurangi tekanan kontak dan mengurangi keausan

MODELLING OF CO2 SOLUBILITY IN DIETHANOLAMINE, NMETHYLDIETHANOLAMINE AND THEIR MIXTURES USING ARTIFICIAL NEURAL NETWORK

Natural gas has a wide range of acid gas concentrations, from parts per million to 50 volume percent and higher, depending on the nature of the rock formation from which it comes. Because of the corrosiveness of H2S and CO2 in the presence of water and because of the toxicity of H2S and the lack of heating value of CO2, sales gas is required to be sweetened to contain no more than a quarter grain H2S per 100 standard cubic feet (4 parts per million) and to have a heating value of no less than 920 to 980 Btu/SCF, depending on the contract. The most widely used processes to sweeten natural gas are those using the alkanolamines, and of the alkanolamines the two most common are n-methyldiethanolamine (MDEA) and diethanolamine (DEA). In this research, data from Khalid Osman et al (2012), A. Benamor et al (2005) and Zhang et al (2002) will be used to simulate the solubility of CO2 in MDEA + DEA aqueous solution using ANN model and the performance will be compared to show which model is better for CO2 absorption. Besides, the study of CO2 solubility in MDEA and DEA aqueous solution respectively will be using data from Jou et al (1982) and Lee et al (1972) works and simulation of ANN model was used to compare the performance between ANN model and the reference research works mentioned earlier. Developed model has an absolute relative deviation (δAAD) of 8.71% while δAAD for data from Khalid Osman et al (2012), A. Benamor et al (2005) and Zhang et al (2002) are 17.06%, 12.09% and 9.82% respectively. In terms of pure amine prediction, ANN model of CO2 solubility predicted in pure MDEA has δAAD of 8.29% while the reference paper which is A. Benamor et al (2005) has absolute relative deviation of 10.76%. For prediction in pure DEA, the model has δAAD of 3.33% compared to reference paper which is also from A. Benamor et al (2005) with 4.72%. ANN has great ability to predict CO2 solubility in pure MDEA, DEA, and their mixtures only by developing models for each situation and condition due to the limitation of ANN itself which cannot simulate the new input data if they do not have same patterns with the one that has been used to develop the model

Эффективность фотодинамического воздействия в сочетании с озоном и хлорофиллом из листьев Dracaena angustifolia на биопленки Staphylicoccus aureus

Photodynamic inactivation is an effective treatment that uses light irradiation, photosensitizer and oxygen. The aim of this study was to determine photodynamic effectiveness of laser diode combined with ozone to reduce Staphylococcus aureus biofilm using exogenous chlorophyll (Chlo). The chlorophyll was extracted from leave of Dracaena angustifolia. To determine the antibacterial effect of S. aureus biofilm treatments, samples were separated into Chlo, Laser, Chlo+Laser, Ozone, Ozone+Laser, Chlo+Ozone+Laser categories. The data were analyzed using ANOVA test. The result of this study showed that Chlo+Ozone+Laser combine treatment at 20 s exposure of ozone with 4 min of irradiation time lead to 80.26 % reduction of biofilm activity, which was the highest efficacy of all the treatment groups. The combination of laser, chlorophyll and lower ozone concentration increases the effectiveness of photodynamic inactivation.Фотодинамическая терапия – эффективный метод инактивации бактериальных биопленок, основанный на сочетании воздействий светового излучения, фотосенсибилизатора и кислорода. Цель данного исследования – определение эффективности лазерного облу- чения в сочетании с озоном при добавлении экзогенного хлорофилла для инактивации биопленки Staphylococcus aureus (S. aureus). Хлорофилл был извлечен из листьев растения Dracaena angustifolia. В ходе исследования на образцах биопленки S. aureus оценива- лась антибактериальная активность каждого фактора в отдельности (лазерное излучение, озон, хлорофилл) и нескольких их сочета- ний (хлорофилл + лазерное облучение; озон + лазерное облучение; хлорофилл + озон + лазерное облучение). Полученные данные были проанализированы с использованием теста ANOVA. Анализ результатов исследования показал, что комбинированная обра- ботка озоном в течение 20 с в присутствии хлорофилла с последующим облучением в течение 4 мин снизила активность биопленок на 80,26%, показав самую высокую эффективность среди всех тестируемых групп. Для повышения эффективности фотодинамической терапии бактериальных биопленок рекомендуется использовать комбинацию лазерного излучения с хлорофиллом и озоном